自动门
自动门:微差式测量法
发布时间:2015/4/19
自动门讯:
微差式测量法:
微差式测量法是综合了偏差式测量法与零位式测量法的优点而提出的一种测量方法。它将被测的未知量与已知的标准量进行比较,并取得差值,然后用偏差式测量法求得此偏差值。应用这种方法进行测量时,标准量具装在仪表内,标准量直接与被测量进行比较,由于两者的值很接近,因此,不需要调整标准量。
微差式测量法的优点是反应快,而且测量精确度高。它特别适于在线控制参数的控制。
例如,在计算机控制的连续轧纲生产线上,参与校制过程工作的X射线测厚仪就是按照微差式测量方法工作的。这时被测量是板料厚度,已知的标准量是板料厚度的设定值。测厚仪只显示偏差,由于整个轧机系统是处于闭环控制过程中,因此轧制过程中的板厚偏差值是很小的。微差式测量法是一种很有发展前途的测量方法,在工程测量中会将获得越来越广泛的应用。
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